WO2016125738A1 - Système de purification des gaz d'échappement pour moteur à combustion interne, moteur à combustion interne et procédé de purification des gaz d'échappement pour un moteur à combustion interne - Google Patents

Système de purification des gaz d'échappement pour moteur à combustion interne, moteur à combustion interne et procédé de purification des gaz d'échappement pour un moteur à combustion interne Download PDF

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WO2016125738A1
WO2016125738A1 PCT/JP2016/052905 JP2016052905W WO2016125738A1 WO 2016125738 A1 WO2016125738 A1 WO 2016125738A1 JP 2016052905 W JP2016052905 W JP 2016052905W WO 2016125738 A1 WO2016125738 A1 WO 2016125738A1
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exhaust gas
temperature
control
internal combustion
combustion engine
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PCT/JP2016/052905
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English (en)
Japanese (ja)
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長岡　大治
輝男 中田
隆行 坂本
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いすゞ自動車株式会社
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Priority to CN201680008748.3A priority Critical patent/CN107208521B/zh
Priority to US15/549,137 priority patent/US10385747B2/en
Priority to EP16746569.9A priority patent/EP3255258B1/fr
Publication of WO2016125738A1 publication Critical patent/WO2016125738A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
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    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
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    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
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    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/103—Oxidation catalysts for HC and CO only
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    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
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    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/04—Exhaust treating devices having provisions not otherwise provided for for regeneration or reactivation, e.g. of catalyst
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    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
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    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
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    • F01N2900/1402—Exhaust gas composition
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    • F01N2900/1404—Exhaust gas temperature
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    • F01N2900/1602—Temperature of exhaust gas apparatus
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    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
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    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
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    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
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    • F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
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    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
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    • F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
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    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
    • F02D41/1441—Plural sensors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention avoids insufficient heating of each catalyst device, overshoot at the time of temperature increase, catalyst thermal deterioration, and catalyst melting loss when regenerating each catalyst device provided in an exhaust gas purification device of an internal combustion engine.
  • the present invention relates to an internal combustion engine exhaust gas purification system, an internal combustion engine, and an exhaust gas purification method for an internal combustion engine that can reliably perform regeneration processing.
  • components to be purified such as hydrocarbons (HC), carbon monoxide (CO), particulate matter (PM), and nitrogen oxides (NOx) contained in exhaust gas from internal combustion engines such as diesel engines are purified.
  • an exhaust gas purification apparatus having various catalytic devices such as an oxidation catalyst device (DOC), a particulate collection device (CSF, SCRF, etc.), a selective reduction catalyst device (SCR), a lean NOx trap catalyst device (LNT), etc.
  • DOC oxidation catalyst device
  • CSF particulate collection device
  • SCRF selective reduction catalyst device
  • LNT lean NOx trap catalyst device
  • the detected temperature by an exhaust gas temperature sensor provided in the vicinity of one of the catalyst devices, or any catalyst obtained by any method is the control temperature that is the control value of the feedback control with respect to the target temperature of the exhaust gas in the temperature rise control. If there are several catalyst devices, the temperature rise is usually from the viewpoint of responsiveness.
  • the temperature related to the catalyst device that generates the largest amount of heat generated by the combustion of unburned hydrocarbon (HC) supplied for the purpose is fixedly used as this control temperature.
  • the selective reduction catalyst and the selective reduction catalyst are disposed upstream of the exhaust gas to form an oxidation catalyst layer.
  • a particulate filter capable of collecting particulates in exhaust gas
  • a liquid injection nozzle capable of injecting a hydrocarbon-based liquid toward the particulate filter
  • a liquid supply means for supplying liquid to the liquid injection nozzle.
  • an exhaust gas purifying apparatus that detects the temperature of exhaust gas related to the particulate filter with a temperature sensor and purifies the exhaust gas of the engine that controls the liquid supply means based on the detection output of the temperature sensor.
  • the location (catalyst device) with the largest amount of heat generation may differ depending on the operating conditions of the engine, depending on the zone coat that coats a plurality of catalyst devices and catalyst layers for each part.
  • the zone coat that coats a plurality of catalyst devices and catalyst layers for each part.
  • the upstream oxidation catalyst device The hydrocarbons burn and generate heat.
  • the temperature in each catalyst device rises due to heat transfer from the exhaust gas heated by the oxidation catalyst device, rather than the generation of combustion heat of hydrocarbons. It will be.
  • the excess air ratio in the exhaust gas is low and the oxygen concentration is low, such as sulfur purge (S purge: sulfur purge) control or NOx regeneration rich combustion
  • S purge sulfur purge
  • NOx regeneration rich combustion the oxygen and NOx adsorbed on the lean NOx trap catalyst device are reduced. Since hydrocarbon combustion occurs using the generated oxygen, the lean NOx trap catalyst device may generate more hydrocarbon combustion heat than the oxidation catalyst device.
  • the place where the amount of fuel heat generation becomes the largest may vary depending on the operating conditions of the engine. If the control temperature during temperature rise control is fixed to a temperature related to a specific catalyst device such as a catalyst device that generates the largest amount of heat generated by hydrocarbon combustion, depending on the operating conditions of the engine, In another catalyst device, there is a possibility that temperature rise failure, overshoot at the time of temperature rise, melting damage and the like may occur.
  • the present inventor between the change of the catalyst device having the highest heat generation amount in the exhaust passage and the high degree of temperature rise and the oxygen concentration of the exhaust gas when the operating state of the engine changes, I found out there was a correlation. For example, when the exhaust gas has a high excess air ratio and a high oxygen concentration, the amount of heat generated by the oxidation catalyst device increases during PM regeneration or when the engine is under a high load, while the excess air ratio in the exhaust gas decreases. It was found that there is a phenomenon that the heat generation amount of the lean NOx trap catalyst device is large when the oxygen concentration is low, during sulfur purge control or when the engine is under a low load.
  • the position of the control temperature in the feedback control in other words, the catalyst device related to the control temperature to be the target temperature is selected and changed in consideration of the oxygen concentration of the exhaust gas, that is, the oxygen of the exhaust gas. Based on the concentration, it has been found that it is preferable to change the catalyst device related to the control temperature, in other words, the position where the control temperature is measured.
  • a control temperature related to the temperature of the preceding oxidation catalyst device is adopted, and when the excess air ratio or oxygen concentration is low, control related to the temperature of the lean NOx trap catalyst device is adopted.
  • adopt temperature is related with the measurement temperature related to the temperature of a front
  • a weight (target temperature ratio) is assigned to each measured temperature, and the control temperature is calculated with these weighted averages while gradually changing the weight according to the excess air ratio or oxygen concentration. It was found that the temperature rise control should be performed by feedback control.
  • the present invention has been made in view of the above, and an object of the present invention is to purify exhaust gas of an internal combustion engine having an oxidation catalyst device on the upstream side and a lean NOx trap catalyst device on the downstream side in the exhaust passage of the internal combustion engine.
  • the catalyst device temperature is insufficient, overshoot at the time of temperature increase, catalyst thermal deterioration, catalyst melting loss
  • An object of the present invention is to provide an exhaust gas purification system for an internal combustion engine, an internal combustion engine, and an exhaust gas purification method for the internal combustion engine that can be avoided and can be reliably regenerated.
  • an exhaust gas purification system for an internal combustion engine comprises an exhaust gas passage for an internal combustion engine provided with an oxidation catalyst device on the upstream side and a lean NOx trap catalyst device on the downstream side.
  • the control device that controls the exhaust gas purification system performs the temperature rise control of the exhaust gas by the regeneration control for recovery of the purification capability of the exhaust gas purification system, the feedback control in this temperature rise control
  • the control temperature measurement position which is the control amount of the exhaust gas, is controlled to change depending on the excess air ratio or oxygen concentration of the exhaust gas passing through the exhaust passage.
  • the control temperature that is the control amount of feedback control in this temperature rise control that is, By changing and setting the measurement position of the control temperature that should be the target temperature in consideration of the oxygen concentration of the exhaust gas, more specifically, the control temperature is set to the most heat generation amount at that time in the exhaust gas purification system.
  • a first temperature sensor for measuring a first temperature related to the temperature of the oxidation catalyst device and a second temperature related to the temperature of the lean NOx trap catalyst device are measured.
  • a second temperature sensor for controlling the temperature of the exhaust gas when the control device performs temperature rise control of the exhaust gas by regeneration control to recover the purification capacity of the exhaust gas purification system.
  • the temperature rise control can be performed at the temperature of the lean NOx trap catalyst device by setting the second temperature related to the lean NOx trap catalyst device as the control temperature.
  • the temperature rise control of the exhaust gas can be optimized.
  • the control device passes through the exhaust passage when the temperature control of the exhaust gas is performed by regeneration control in order to recover the purification capacity of the exhaust gas purification system.
  • the weight coefficient is set by changing the excess air ratio or oxygen concentration of the exhaust gas passing through the exhaust passage.
  • an internal combustion engine of the present invention is configured to include the exhaust gas purification system of the internal combustion engine, and has the same effects as the exhaust gas purification system of the internal combustion engine. it can.
  • an exhaust gas purification method for an internal combustion engine of the present invention for achieving the above object is an internal combustion engine equipped with an oxidation catalyst device on the upstream side and a lean NOx trap catalyst device on the downstream side in the exhaust passage of the internal combustion engine.
  • feedback control in the temperature rise control is performed when the exhaust gas temperature rise control is performed in the regeneration control for recovery of the purification ability of the exhaust gas purification system.
  • the measurement position of the control temperature which is the control amount, is changed according to the excess air ratio or the oxygen concentration of the exhaust gas passing through the exhaust passage, and is similar to the exhaust gas purification system of the internal combustion engine described above. The effect of this can be achieved.
  • the exhaust gas temperature increase control when the exhaust gas temperature increase control is performed to regenerate each catalyst device provided in the exhaust gas purification device.
  • the control temperature that is the control amount of the feedback control in this temperature rise control that is, the measurement position of the control temperature that should be the target temperature is changed and set in consideration of the oxygen concentration of the exhaust gas, so that it can be more detailed. Since the control temperature is set to a temperature related to the catalyst device that generates the largest amount of heat at that time in the exhaust gas purification system, the exhaust gas temperature increase control can be optimized. Insufficient temperature rise of each catalyst device, overshoot at the time of temperature rise, thermal deterioration of the catalyst, and catalyst melting damage can be avoided, and the regeneration process can be performed reliably.
  • FIG. 1 is a diagram schematically showing the configuration of an internal combustion engine equipped with an exhaust gas purification system for an internal combustion engine according to an embodiment of the present invention.
  • FIG. 2 is a diagram schematically illustrating a relationship between a weighting factor that is a weighting ratio of the first temperature to the second temperature and an excess air ratio of the exhaust gas.
  • the internal combustion engine of the embodiment according to the present invention is configured to include the exhaust gas purification system of the internal combustion engine of the embodiment according to the present invention, and has the same effect as the exhaust gas purification system of the internal combustion engine described later. The effect of this can be achieved.
  • an internal combustion engine (hereinafter referred to as an engine) 10 and an exhaust gas purification system 20 for an internal combustion engine according to an embodiment of the present invention will be described with reference to FIG.
  • the engine 10 is provided with a fuel injection device 11, an intake valve 12 and an exhaust valve 13 facing a cylinder (cylinder) 10 a, and further, an intake passage 14 communicating with the intake valve 12 and an exhaust valve 13.
  • An exhaust passage 15 and an EGR passage 16 are provided.
  • the intake passage 14 is provided with an air cleaner 17, a turbocharger (turbo supercharger) 18 compressor 18 b, an intercooler 19 a, and an intake throttle valve 19 b in order from the upstream side.
  • a turbine 18a of the turbocharger 18 and an exhaust gas purification device 21 are provided in this order from the side.
  • the EGR passage 16 is provided by connecting an intake passage 14 downstream of the compressor 18b and an exhaust passage 15 upstream of the turbine 18a.
  • the EGR passage 16 is provided with an EGR cooler 16a and an EGR valve 16b in this order from the upstream side. Is provided.
  • EGR gas exhaust gas
  • the exhaust gas purification device 21 of the exhaust gas purification system 20 includes an oxidation catalyst device (DOC) 22, a particulate collection device (CSF) 23, a lean NOx trap catalyst device (LNT) 24, and a rear stage in the configuration of FIG.
  • a catalyst device such as an oxidation catalyst device (DOC) 25 is provided.
  • the arrangement order of the particulate collection device 23 and the lean NOx trap catalyst device 24 is reversed, that is, the oxidation catalyst device 22, the lean NOx trap catalyst device 24, the particulate collection device 23, and the subsequent oxidation catalyst device 25 in this order.
  • the exhaust gas purification device 20 may be provided with each catalyst device.
  • a fuel injection device 26 for injecting unburned fuel into the exhaust passage 15 is disposed in the exhaust passage 15 upstream of the oxidation catalyst device 22, and NOx regeneration control for the lean NOx trap catalyst device 24, the oxidation catalyst device.
  • the unburned fuel is injected into the exhaust passage 15 at the time of exhaust gas temperature rise control such as sulfur purge control for the NOx 22 and lean NOx trap catalyst device 24 and PM regeneration control for the particulate collection device 23.
  • exhaust gas temperature rise control such as sulfur purge control for the NOx 22 and lean NOx trap catalyst device 24 and PM regeneration control for the particulate collection device 23.
  • the lean NOx trap catalyst device 24 is heated to the temperature range for releasing and reducing the stored NOx, or fine particles.
  • the temperature of the collection device 23 is raised to a temperature range where PM combustion is possible, or the temperature of the oxidation catalyst device 22 and the lean NOx trap catalyst device 24 is raised to a temperature range where desulfurization is possible. Thereby, the exhaust gas purification capacity of each catalyst device 22, 23, 24 is recovered.
  • a first temperature sensor 31 for detecting the temperature T DOC of the exhaust gas Ga flowing into the oxidation catalyst device 22 is disposed in the exhaust passage 15 upstream (inlet side) of the oxidation catalyst device 22, and lean NOx.
  • a second temperature sensor 32 for detecting the temperature T LNT of the exhaust gas Ga flowing into the lean NOx trap catalyst device 24 is disposed in the exhaust passage 15 upstream of the trap catalyst device 24, and the oxidation catalyst device 22 and the particulates
  • a third temperature sensor 33 that detects the temperature T CSF of the exhaust gas Ga that flows out of the oxidation catalyst device 22 and flows into the particulate collection device 23 is disposed in the exhaust passage 15 between the collection devices 23.
  • a ⁇ sensor 34 or an oxygen concentration sensor (not shown) for measuring the excess air ratio ⁇ or the oxygen concentration Co of the exhaust gas Ga is disposed on the downstream side of the exhaust gas purification device 20.
  • the ⁇ sensor or the oxygen concentration sensor may be disposed on the upstream side of the exhaust gas purification device 20 or may be disposed on the exhaust manifold.
  • the temperature T DOC detected by the first temperature sensor 31 is the first temperature T1 related to the oxidation catalyst device 22, and the temperature TLNT detected by the second temperature sensor 32 is the first temperature T1 related to the lean NOx trap catalyst device 24.
  • the temperature T CSF detected by the third temperature sensor 33 is a third temperature T 3 related to the particulate collection device 23.
  • the average value of the temperatures detected by the temperature sensors before and after the oxidation catalyst device 22 may be the first temperature T1, or the average value of the temperatures detected by the temperature sensors before and after the lean NOx trap catalyst device 24 is the second temperature. It is good also as T2, and it is good also considering the average value of the temperature detected with the temperature sensor before and behind the particulate collection device 23 as 3rd temperature. Further, instead of the exhaust gas temperature on the upstream side of each catalyst device 22, 23, 24, the exhaust gas temperature on the downstream side may be used.
  • control device 40 for controlling the exhaust gas purification system 20 for the internal combustion engine of the present invention is provided.
  • the control device 40 is normally configured to be incorporated in an engine control unit (ECU) that controls the operation state of the engine 10 in general, but may be provided independently.
  • ECU engine control unit
  • the control device 40 that controls the exhaust gas purification system 20 is regeneration control for recovery of the purification capability of the exhaust gas purification system 20.
  • the measurement position of the control temperature Tc which is the control amount of feedback control in this temperature rise control, is set to the excess air ratio ⁇ or the oxygen concentration Co of the exhaust gas G passing through the exhaust passage 15. Control to change by.
  • the control temperature Tc depends on each regeneration process.
  • the amount of unburned fuel (hydrocarbon) injected by the fuel injection device 26 is adjusted so that the target temperature Tm is set.
  • the measurement position of the control temperature Tc is changed according to the excess air ratio ⁇ or the oxygen concentration Co of the exhaust gas Ga. More specifically, the temperature (any one of T1, T2, and T3) of the catalyst device (any one of 22, 23, and 24) having the largest heat generation amount and the highest temperature in the exhaust passage 15 at that time is set to one. Change to the measurement temperature that best reflects it.
  • the control temperature Tc is set to the control temperature Tc of the exhaust gas Ga passing through the exhaust passage 15.
  • the first temperature T1 is set.
  • the second temperature T2 is set.
  • the upper limit threshold A1 and the lower limit threshold A2 are set in advance by experiments or the like and stored in the control device 40. Further, when simplifying the control, the upper limit threshold A1 and the lower limit threshold A2 may be the same. In this case, it is preferable to set the first temperature T1 and the second temperature T2 to be substantially equal. .
  • the excess air ratio ⁇ and the oxygen concentration Co of the exhaust gas Ga are higher than the upper limit threshold A1, and therefore,
  • the first temperature T1 to be the control temperature Tc
  • the temperature rise can be controlled at the first temperature T1 of the oxidation catalyst device 22, and the heat generation amount of the lean NOx trap catalyst device 24 is larger than that of the oxidation catalyst device 22.
  • the excess air ratio ⁇ and the oxygen concentration Co of the exhaust gas Ga are lower than the preset lower limit threshold A2, so that the second temperature T2 related to the lean NOx trap catalyst device 24 is set to the control temperature Tc, thereby making the lean NOx trap. Since the temperature rise control can be performed at the second temperature T2 of the catalyst device 24, the temperature rise control of the exhaust gas Ga can be optimized with a relatively simple control. .
  • the control device 40 performs the temperature rise control of the exhaust gas Ga by the regeneration control in order to recover the purification capability of the exhaust gas purification system 20, the excess air ratio ⁇ of the exhaust gas Ga passing through the exhaust passage 15 or
  • the weighting factor ⁇ is set by changing the excess air ratio ⁇ or the oxygen concentration Co
  • the control temperature Tc is the first temperature using the weighting factor ⁇ .
  • Control is performed to obtain a weighted average value T12 between T1 and the second temperature T2.
  • the temperature rise control can be performed while avoiding a sudden change due to the switching of the control temperature Tc with respect to the change in the excess air ratio ⁇ or the oxygen concentration Co.
  • the excess air ratio ⁇ is set and stored in the control device 40.
  • the weighting factor ⁇ is set as a value that increases as the excess air ratio ⁇ decreases and decreases as the excess air ratio ⁇ increases.
  • the correlation between the excess air ratio ⁇ and the weighting factor ⁇ is a straight-lined downward relationship, but this straight-line relationship in FIG. There may be a curved relationship with a convex shape on the upper right.
  • the temperature of the catalyst device having the maximum heat generation amount based on the oxygen concentration ⁇ of the exhaust gas Ga is three or more, for example, T DOC , T LNT , T CSF
  • the number of weighting factors is increased to obtain a weighted average.
  • This method is an exhaust gas purification method for an internal combustion engine in the exhaust gas purification system 20 for the internal combustion engine described above, and the temperature rise control of the exhaust gas Ga is performed by regeneration control for recovery of the purification capability of the exhaust gas purification system 20.
  • the measurement position of the control temperature Tc which is the control amount of the feedback control in the temperature increase control, is changed by the excess air ratio ⁇ or the oxygen concentration Co of the exhaust gas Ga passing through the exhaust passage 15.
  • the exhaust gas that is used to regenerate the catalyst devices 22, 23, and 24 provided in the exhaust gas purification device 21 According to the exhaust gas purification system 20 of the internal combustion engine, the internal combustion engine 10 and the exhaust gas purification method of the internal combustion engine, the exhaust gas that is used to regenerate the catalyst devices 22, 23, and 24 provided in the exhaust gas purification device 21.
  • the measurement position of the control temperature Tc which is the control amount of feedback control in this temperature rise control, that is, the control temperature Tc to be the target temperature Tm, is set to the excess air ratio ⁇ or oxygen of the exhaust gas Ga.
  • the control temperature Tc is set to the catalyst devices 22, 23, and 24 where the heat generation amount is the highest in the exhaust gas purification system 20 at that time.
  • the temperature control of the exhaust gas Ga can be optimized by setting the related temperatures T1, T2, and T3, the catalyst devices 22, 23, and 24 are not sufficiently heated, Over-shoot, thermal deterioration of the catalyst, can be prevented from melting of the catalyst, it is possible to reliably perform playback processing.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

Lorsqu'une commande d'élévation de la température des gaz d'échappement Ga est exécutée par une commande de régénération pour restaurer la capacité de purification d'un système de purification de gaz d'échappement (20), la position de mesure d'une température de commande Tc qui est la quantité commandée par une commande de rétroaction pendant la commande d'élévation de température, varie en fonction du rapport d'excès d'air λ ou de la teneur Co en oxygène du gaz d'échappement Ga traversant un passage d'échappement (15) L'invention concerne également un système de purification de gaz d'échappement pour moteur à combustion interne, comprenant un dispositif de catalyseur d'oxydation côté amont et un dispositif de catalyseur de piégeage de NOx appauvri côté aval dans le passage d'échappement du moteur à combustion interne, le système de purification de gaz d'échappement pour moteur à combustion interne étant tel qu'une élévation de température insuffisante dans les dispositifs de catalyse, un dépassement de l'élévation de température, et la détérioration/l'érosion thermique des catalyseurs sont évitées, et un processus de régénération est réalisé de manière fiable pendant la commande d'élévation de la température du gaz d'échappement pour restaurer la capacité de purification des gaz d'échappement des dispositifs de catalyseur. L'invention concerne également un moteur à combustion interne, et un procédé de purification de gaz d'échappement pour moteur à combustion interne.
PCT/JP2016/052905 2015-02-06 2016-02-01 Système de purification des gaz d'échappement pour moteur à combustion interne, moteur à combustion interne et procédé de purification des gaz d'échappement pour un moteur à combustion interne WO2016125738A1 (fr)

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CN201680008748.3A CN107208521B (zh) 2015-02-06 2016-02-01 内燃机的排气气体净化系统、内燃机及内燃机的排气气体净化方法
US15/549,137 US10385747B2 (en) 2015-02-06 2016-02-01 Exhaust gas purification system for internal combustion engine, internal combustion engine, and exhaust gas purification method for internal combustion engine
EP16746569.9A EP3255258B1 (fr) 2015-02-06 2016-02-01 Système de purification des gaz d'échappement pour moteur à combustion interne, moteur à combustion interne et procédé de purification des gaz d'échappement pour un moteur à combustion interne

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JP2015022016A JP2016145532A (ja) 2015-02-06 2015-02-06 内燃機関の排気ガス浄化システム、内燃機関及び内燃機関の排気ガス浄化方法

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DE102018212751A1 (de) * 2018-07-31 2020-02-06 Continental Automotive Gmbh Verfahren und Vorrichtung zur Temperaturregelung im Abgastrakt einer Brennkraftmaschine
JP7124771B2 (ja) * 2019-03-08 2022-08-24 いすゞ自動車株式会社 ラムダセンサーの応答性診断方法、及び排気浄化システム
CN110925107B (zh) * 2019-12-20 2022-02-22 潍柴西港新能源动力有限公司 一种燃气发电发动机燃料闭环控制方法
CN114352388B (zh) * 2022-01-19 2023-06-23 宁波吉利罗佑发动机零部件有限公司 一种发动机的废气排放后处理系统和方法以及它们的用途

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CN107208521A (zh) 2017-09-26
CN107208521B (zh) 2019-08-30
US10385747B2 (en) 2019-08-20
EP3255258B1 (fr) 2019-07-03
US20180023435A1 (en) 2018-01-25
JP2016145532A (ja) 2016-08-12
EP3255258A4 (fr) 2018-06-20

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